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| author | Dennis Zhou | 2019-02-26 18:56:16 +0100 |
|---|---|---|
| committer | Dennis Zhou | 2019-03-13 20:25:31 +0100 |
| commit | 047924c96898266e9a37412434abd1db72600384 (patch) | |
| tree | f77d37338673405e89644bc682e08a8f7584aa03 /mm | |
| parent | percpu: use block scan_hint to only scan forward (diff) | |
| download | kernel-qcow2-linux-047924c96898266e9a37412434abd1db72600384.tar.gz kernel-qcow2-linux-047924c96898266e9a37412434abd1db72600384.tar.xz kernel-qcow2-linux-047924c96898266e9a37412434abd1db72600384.zip | |
percpu: make pcpu_block_md generic
In reality, a chunk is just a block covering a larger number of bits.
The hints themselves are one in the same. Rather than maintaining the
hints separately, first introduce nr_bits to genericize
pcpu_block_update() to correctly maintain block->right_free. The next
patch will convert chunk hints to be managed as a pcpu_block_md.
Signed-off-by: Dennis Zhou <dennis@kernel.org>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/percpu-internal.h | 1 | ||||
| -rw-r--r-- | mm/percpu.c | 20 |
2 files changed, 14 insertions, 7 deletions
diff --git a/mm/percpu-internal.h b/mm/percpu-internal.h index ec58b244545d..119bd1119aa7 100644 --- a/mm/percpu-internal.h +++ b/mm/percpu-internal.h @@ -28,6 +28,7 @@ struct pcpu_block_md { int right_free; /* size of free space along the right side of the block */ int first_free; /* block position of first free */ + int nr_bits; /* total bits responsible for */ }; struct pcpu_chunk { diff --git a/mm/percpu.c b/mm/percpu.c index c5250e162d4d..acc72d37a830 100644 --- a/mm/percpu.c +++ b/mm/percpu.c @@ -654,7 +654,7 @@ static void pcpu_block_update(struct pcpu_block_md *block, int start, int end) if (start == 0) block->left_free = contig; - if (end == PCPU_BITMAP_BLOCK_BITS) + if (end == block->nr_bits) block->right_free = contig; if (contig > block->contig_hint) { @@ -1267,18 +1267,24 @@ static void pcpu_free_area(struct pcpu_chunk *chunk, int off) pcpu_chunk_relocate(chunk, oslot); } +static void pcpu_init_md_block(struct pcpu_block_md *block, int nr_bits) +{ + block->scan_hint = 0; + block->contig_hint = nr_bits; + block->left_free = nr_bits; + block->right_free = nr_bits; + block->first_free = 0; + block->nr_bits = nr_bits; +} + static void pcpu_init_md_blocks(struct pcpu_chunk *chunk) { struct pcpu_block_md *md_block; for (md_block = chunk->md_blocks; md_block != chunk->md_blocks + pcpu_chunk_nr_blocks(chunk); - md_block++) { - md_block->scan_hint = 0; - md_block->contig_hint = PCPU_BITMAP_BLOCK_BITS; - md_block->left_free = PCPU_BITMAP_BLOCK_BITS; - md_block->right_free = PCPU_BITMAP_BLOCK_BITS; - } + md_block++) + pcpu_init_md_block(md_block, PCPU_BITMAP_BLOCK_BITS); } /** |